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annotate src/org/tmatesoft/hg/internal/ChangesetParser.java @ 673:545b1d4cc11d

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Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 12 Jul 2013 20:14:24 +0200
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545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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1 /*
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2 * Copyright (c) 2010-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
545b1d4cc11d Refactor HgBundle.GroupElement (clear experimental mark), resolve few technical debt issues
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.io.IOException;
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20 import java.util.ArrayList;
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21 import java.util.Collections;
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22 import java.util.Date;
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23 import java.util.HashMap;
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24 import java.util.List;
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25 import java.util.Map;
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26
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.core.SessionContext;
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29 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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30 import org.tmatesoft.hg.repo.HgInvalidDataFormatException;
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31 import org.tmatesoft.hg.repo.HgRepository;
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32
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33 /**
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34 * @see mercurial/changelog.py:read()
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35 *
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36 * <pre>
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37 * format used:
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38 * nodeid\n : manifest node in ascii
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39 * user\n : user, no \n or \r allowed
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40 * time tz extra\n : date (time is int or float, timezone is int)
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41 * : extra is metadatas, encoded and separated by '\0'
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42 * : older versions ignore it
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43 * files\n\n : files modified by the cset, no \n or \r allowed
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44 * (.*) : comment (free text, ideally utf-8)
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45 *
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46 * changelog v0 doesn't use extra
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47 * </pre>
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48 *
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49 * Extracted from internals of HgChangelog (the code initially from inside RawChangeset)
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50 *
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51 * @author Artem Tikhomirov
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52 * @author TMate Software Ltd.
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53 */
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54 public final class ChangesetParser {
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55 private final EncodingHelper encHelper;
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56 // it's likely user names get repeated again and again throughout repository.
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57 private final Pool<String> usersPool;
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58 private final Pool<String> filesPool;
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59 private final CsetFactory factory;
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60
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61 public ChangesetParser(SessionContext.Source sessionContex, CsetFactory csetFactory) {
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62 assert csetFactory != null;
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63 encHelper = Internals.buildFileNameEncodingHelper(sessionContex);
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64 usersPool = new Pool<String>();
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65 filesPool = new Pool<String>();
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66 factory = csetFactory;
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67 }
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68
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69 public void dispose() {
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70 usersPool.clear();
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71 filesPool.clear();
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72 }
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73
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74 public RawChangeset parse(DataAccess da) throws IOException, HgInvalidDataFormatException {
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75 byte[] data = da.byteArray();
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76 return parse(data);
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77 }
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78
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79 public RawChangeset parse(byte[] data) throws HgInvalidDataFormatException {
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80 return init(data, 0, data.length);
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81 }
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82
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83 private RawChangeset init(byte[] data, int offset, int length) throws HgInvalidDataFormatException {
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84 final int bufferEndIndex = offset + length;
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85 final byte lineBreak = (byte) '\n';
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86 int breakIndex1 = indexOf(data, lineBreak, offset, bufferEndIndex);
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87 if (breakIndex1 == -1) {
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88 throw new HgInvalidDataFormatException("Bad Changeset data");
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89 }
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90 Nodeid _nodeid = Nodeid.fromAscii(data, 0, breakIndex1);
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91 int breakIndex2 = indexOf(data, lineBreak, breakIndex1 + 1, bufferEndIndex);
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92 if (breakIndex2 == -1) {
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93 throw new HgInvalidDataFormatException("Bad Changeset data");
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94 }
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95 String _user;
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96 _user = encHelper.userFromChangeset(data, breakIndex1 + 1, breakIndex2 - breakIndex1 - 1);
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97 _user = usersPool.unify(_user);
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98
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99 int breakIndex3 = indexOf(data, lineBreak, breakIndex2 + 1, bufferEndIndex);
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100 if (breakIndex3 == -1) {
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101 throw new HgInvalidDataFormatException("Bad Changeset data");
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102 }
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103 String _timeString = new String(data, breakIndex2 + 1, breakIndex3 - breakIndex2 - 1);
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104 int space1 = _timeString.indexOf(' ');
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105 if (space1 == -1) {
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106 throw new HgInvalidDataFormatException(String.format("Bad Changeset data: %s in [%d..%d]", "time string", breakIndex2+1, breakIndex3));
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107 }
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108 int space2 = _timeString.indexOf(' ', space1 + 1);
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109 if (space2 == -1) {
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110 space2 = _timeString.length();
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111 }
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112 long unixTime = Long.parseLong(_timeString.substring(0, space1));
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113 int _timezone = Integer.parseInt(_timeString.substring(space1 + 1, space2));
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114 // unixTime is local time, and timezone records difference of the local time to UTC.
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115 Date _time = new Date(unixTime * 1000);
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116 String _extras = space2 < _timeString.length() ? _timeString.substring(space2 + 1) : null;
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117 Map<String, String> _extrasMap = parseExtras(_extras);
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118 //
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119 int lastStart = breakIndex3 + 1;
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120 int breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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121 ArrayList<String> _files = null;
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122 if (breakIndex4 > lastStart) {
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123 // if breakIndex4 == lastStart, we already found \n\n and hence there are no files (e.g. merge revision)
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124 _files = new ArrayList<String>(5);
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125 while (breakIndex4 != -1 && breakIndex4 + 1 < bufferEndIndex) {
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126 String fname = encHelper.fileFromChangeset(data, lastStart, breakIndex4 - lastStart);
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127 _files.add(filesPool.unify(fname));
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128 lastStart = breakIndex4 + 1;
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129 if (data[breakIndex4 + 1] == lineBreak) {
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130 // found \n\n
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131 break;
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132 } else {
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133 breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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134 }
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135 }
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136 if (breakIndex4 == -1 || breakIndex4 >= bufferEndIndex) {
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137 throw new HgInvalidDataFormatException("Bad Changeset data");
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138 }
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139 } else {
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140 breakIndex4--;
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141 }
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142 String _comment = encHelper.commentFromChangeset(data, breakIndex4 + 2, bufferEndIndex - breakIndex4 - 2);
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143 RawChangeset target = factory.create(_nodeid, _user, _time, _timezone, _files, _comment, _extrasMap);
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144 return target;
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145 }
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146
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147 private Map<String, String> parseExtras(String _extras) {
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148 final String extras_branch_key = "branch";
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149 _extras = _extras == null ? null : _extras.trim();
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150 if (_extras == null || _extras.length() == 0) {
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151 return Collections.singletonMap(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME);
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152 }
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153 Map<String, String> _extrasMap = new HashMap<String, String>();
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154 int lastIndex = 0;
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155 do {
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156 String pair;
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157 int sp = _extras.indexOf('\0', lastIndex);
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158 if (sp == -1) {
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159 sp = _extras.length();
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160 }
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161 if (sp > lastIndex) {
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162 pair = _extras.substring(lastIndex, sp);
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163 pair = decode(pair);
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164 int eq = pair.indexOf(':');
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165 _extrasMap.put(pair.substring(0, eq), pair.substring(eq + 1));
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166 lastIndex = sp + 1;
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167 }
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168 } while (lastIndex < _extras.length());
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169 if (!_extrasMap.containsKey(extras_branch_key)) {
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170 _extrasMap.put(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME);
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171 }
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172 return Collections.unmodifiableMap(_extrasMap);
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173 }
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174
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175 private static int indexOf(byte[] src, byte what, int startOffset, int endIndex) {
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176 for (int i = startOffset; i < endIndex; i++) {
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177 if (src[i] == what) {
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178 return i;
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179 }
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180 }
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181 return -1;
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182 }
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183
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184 private static String decode(String s) {
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185 if (s != null && s.indexOf('\\') != -1) {
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186 // TestAuxUtilities#testChangelogExtrasDecode
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187 return s.replace("\\\\", "\\").replace("\\n", "\n").replace("\\r", "\r").replace("\\0", "\00");
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188 }
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189 return s;
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190 }
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191
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192 public interface CsetFactory {
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193 public RawChangeset create(Nodeid nodeid, String user, Date time, int timezone, List<String> files, String comment, Map<String, String> extrasMap);
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194 }
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195 }